Photographic shutter.



P. J. MARKS.

PHOTOGRAPHIC SHTTER` APrLmA'non Plum ssr'r. 14, 1811.

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PAU J. MARKS, OF ROCHESTER, NEW -Y ORK, ASSIGNOR T0 EASTMAN KODAK COM- PANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

PHOTOGRAPHIC SHUTTER.

Specification of Letters Patent.

Patented Jan, 7, 1.913.

Application filed September 14, 1911. Serial No. 649,244.

To all 'whom 'it may concem: f

Be it known that I, PAUL J. MARKs, of Rochester, in the county of 'Monroe and State of New York, have invented certain new and useful Improvem'ents in Photoaphic Shutters; and I-do hereby declare to be a full, clear,,and exact description o the same, reference being had to the Aaccompanying drawings, forming a part of this speclfication, and to the re erenoe-numerals marked thereon.

My present invention relates .to photog--- raph and more' particularly to photograp ic shutters of'the automatic type and has for its object to provide simple and convenient means for automatically locking the shutter in itsclosed position whereby the blades are prevented from jarring open and causing'fogging of the film or plate, and. are also prevented from rebounding when actuated to closed position with the same efleet.

A fu-rther object of the invention is to provide for the automatic release of ,such ocking device coincidently with the operation of the parts whose movements cause the opening Of the shutter. i

To these and other ends the invention consists m certain improvements and comb1-.

nations of parts all as willi be hereinafter more fully described, the novel features being pointed. out in the claims at the end" of the specification.

In the drawings: 'Figure 1 is a front ele- 'vation of 'a'shutter constructed in accordance-with 'and illustrating one embodiment vof my invention, 'the front portion 'of the 'casing or cover `plate being removed and the l parts being in their'normal positions withthe shutter closed; Fig. .2 is a similar view of a portion of the mechanism with the lmaster member in set' position and on the point of opening -tionaryv supporting ring 2 and a 'relatively movable rotary rin 3 arranged in thevpresent instanoe beneat the ring 2 and also bear to Fig. 2 with the mas-- neath the diaphragm Operating ring 4, the

diaphragm being not further illustrated herein as it has nothing to do with the present invention. The inner circumference of the ring 3 is coincident with the-inner-circumference of the dia'phra ring 4 and its other circumference is indicated by the :dotted line A. This ring 3 constitutesi'thefiannular actuator that causes the simultaneous operation of the shutter blades 5 'that are pivoted at 6 to the actuator while'their outer ends are bifurcated at 7 to form slidmg b'earings with secondary pivots 8 extending between the stationa'ry ring 2. and the casing so thatthe movement of the actuator 3 in one direction'opens the blades while its movement in Vthe other closes them.

The stationary ring 2 has'a cutaway portion 9 ,on its inner circumference that, during these movements of the actuator, accommodates a p'rojecting abutment 10 o-n the latter, and when the shutter is'moved toV closed position under the influence of' a spring-11, which is connected to the abutment 10 by a hooked poition 12, the closing movement of the blades is limited by the en 'shutter Operating member 155 at 16, while the other end is hooked to form a projeetion' 17; The Operating member 155 is provided with afi spring 18that holds it normally in raised position, as shown in Fig. 1, a stop.

19 thereon engag'ing the oasing, while a spring20, secured at 21, and engaging a projection 22 on the master member, holds the lat-ter normally both in engagement with the operatin member 155 and out of the path offthe a utment 10 on the actuator 3. l/Vhen an instantaneous exposure is to be 1nade,`the operatin ;member 155 is depressed causing the oscil ation ofthe'zn ster member 14 and causing the projeotion' 7 at one end there-of to move towartf the ,abutment 10 on the actuator. The latter'and the said projection 21 are provided, respectively, with coperating cam faces 23 and (Fig. 4) and, the master member being yieldable Iaterally, this allows the project-ion 17 to ride over the abutment 10 and hook in behind it, as shown in Fig. 2. This is as far as the master member moves .in that direction, for at t-his point the operating member 155 slips from engagement therewith at 16 and releases it to be returned by its own spring 20. The said spring- 20 is Stronger than the spring motor 11 of the actuator 3 and, hence, as the master member -retiirns to normal position, it rotates the actuator to the leftl and opens the shutter blades 5. But the actuator3 and the master member are movin on different Centers and the projection 17 is provided with another cam face 25 so that when the parts reach the position of Fig. 3 and the master member continues its movement, the abutment 10 on the actuator slides over this cam surface 25 and'releases itself from the master member underthe influence of its 'own spring motor 11 and returns to the firs't position closing the shutter blades.

Of course, the present shutter is provided with a controlling device, indicated' generally at 26 -by means of which the tensions of the spring motors are' varied to alter the duration of the exposures and also to permit bulb and time 'exposures as Well as instantaneous exposures, but this mechanism has nothing to do with the present invention and no detailed description is, therefore, necessary. Sufiice it to say that the operation .is the same with the bulb and time exposures, except that the master member 14 is haltedin the position of Fig. 3 just before the abutment 10 on the actuator is released to continue under a subsequent impulse and thus allow the blades to remain open for a ,greater or less period.

In' the practice of vmy present invention, as illustrated in this embodiment, I provide at a suitable point, to turn upon a fixed pivot 27, a latch member 28 that has two relatively laterally offset projections 29 and 30 between which engages the spring 31 that has a normal tendency to throw the latch into the path of movement of theabutment 10 on the actuator 3 and thus when the shutter blades are closed, as shown in Fig. 1, the said abutment 10 is held securely between its limiting stop 13 and the'latch 28. However, duringthe initial or setting movement of the master member 14 in which its'- hooked projection 17 moves towardits cooperative relation with the abutment'lO, it engagesl a projection 31a on the other arm of the latch member 28 and operates .the

latter to move it out of engagement withfthe abutment 10, as shown in Fig. 2, so that by the time the master member is ready to move the actuator 3 to openthe shutter, the latch 28 is well out of the ,way and cannot impede the movement of the abutment 10. Of course, the spring 31 of the latch is operating continuously to throw it back into the path of the abutment' 10 but it can not do so until the latter reaches its limiting sto 13 on the return trip and the shutter is closed. In the mean time it happens to ride, in the present embodiment, successively against the hooked end 12 of the spring 11 and then the abutment 10 itself, butv it engages instantly upon the return of the actuator. as shown in Fig. 1, and, therefore, no rebound is permitted the actuator or blade and no subsequent jarring of the shutter as a whole can effect the opening of the blades or any movement whatever thereof. The latch can only be released by the movement of the Operating member 155 and of the master member 14 at the instant before the shutter is to be voluntarily opened in regular operation, p

I claim as my invention:

1. In a shutter, the combination with a shutter blade and an actuator therefor, one of said parts being provided with an abutment, of a motor acting upon the actuator' to normally close the shutter, a looking member movable to an operative position in the' path of the abutment when the shutter is closed to retain the blade in that position and amaster member acting against the actuator' to open the shutter against the action ofthe motor and arranged to disengage the locking member from the abutment during its initial movement.

2. In a shutter, the combination With a shutter blade, and an actuator therefor, one of said arts being provided with anabutment, o means acting upon the actuator 'to normally close the shutter, a looking member hovable to an operative position in'the path of the abutment when the shutter ia closed to retain the blade in that position, and a master member movable into and out of coperaltion with the actuator to successively open `the blade and then release thev same, said master member being'arranged to` disengage the looking member from the abutment as it moves into coperation with the actuator.

3. In a shutter,'the combination with a shutter blade and an actuator therefor, one of said parts being provided with an abutment, of. a spring acting upon the actuator to normally close the, shutter, a-'locking member having an operative'position in the path of the abutment When the shutter is closed to retain the blade in that position, and a master member, movable into and out of coperation 'with the actuator to Suessively open the blade against the tension of the spring and then' release the same, the looking member being connected for movement with the master member to be released thereby from) the path of the abutment as the latter moves into Cooperation-with the actuator.

4. In a shutter, the combination with a blade and an actuator therefor, one of said parts being provided with a projecting abutment and a motor aoting on the actuator to normally close the shutter, of a latoh,

a spring for moving the same into the path of the abutment on one side of the latter when the shutter is closed to retain the blade in that position, a master member movable into and out of coperation With the abutment on the opposite side thereof to successively open the blade against the tension of the motor and then release the same, said master member and the abutment being progagement with the other side during its 20 setting movement.

PAUL J. MARKS.

VVitnesses:

RUssELL B. GrRIFFITH,l FLORENCE E. FRANCK 

